At HDC, we create spaces that allow everyone to feel seen, heard and valued through teaching, coaching and consulting!

HDC Staff

Aaron L. Horn, MA, Ed.D.

Chief Executive Officer

Dr. Aaron L. Horn was born and raised in San Francisco. His twenty years of human service includes teaching, counseling and coaching.

His research afforded him the opportunity to publish three books dedicated to deepening human relationships, particularly those concerning young Black Males. Dr. Horn’s number one passion is altering the negative behaviors of human beings through his methodology of R.A.M. – Relationships, Accountability and Mentoring. Dr. Horn’s first book is titled “The Role of Father-Like Care in the Education of Young Black Males”.

This qualitative study analyzes African American males’ perceptions of the tutor-tutee relationship within in-home, one-on-one tutoring. His second book is titled “I Got’Cho Back! Improving Relationships with Young Black Males.”I Got’cho Back provides an historical context for some of the most profound lifespan development issues that impact many young Black males in America. Dr. Horn’s third book, “The Beauty of R.A.M. Deepening Human Connections through Relationships, Accountability, and Mentoring” is a step-by-step resource guide on how to effectively serve clients in underserved communities. Dr. Horn has received numerous awards and accolades, including “Community Advocate Award” from San Francisco State University and the “Edward J. Griffin Award” from the University of San Francisco. Dr. Horn is currently an Adjunct Professor at the University of San Francisco, Counseling Psychology Department and the Chief Executive Officer of Horn Development Consulting (HDC), a professional coaching organization located in San Francisco, California.

Colette is a New York native from a strong Caribbean background with over twenty -three years of experience in higher education and mental health. She proudly exudes her cultural values and beliefs in the work that she does and how she connects with individuals. Colette believes in the Jamaican motto of her parent’s rich heritage, “Out of many, one people.” Colette began demonstrating her social work skills by assisting her mother as a young child when she participated in church activities. Colette continued to seek out various opportunities to assist others by volunteering for various causes in high school and college, undergraduate and graduate such as the Special Olympics and the AIDS walk. Colette’s journey continued where she received her education from Stony Brook University, the University of Vermont and Chapman University. She has her BA in English, MA in Liberal Studies and Counseling, and her Masters in Social Work. Colette’s professional experience ranges from working in EOP, residential life, student activities, school based counseling, parenting education and community mental health. Colette attributes much of her success to the skills that she developed as an Office Assistant, Resident Assistant and Peer Educator when she was an undergraduate at Stony Brook University. Colette has also obtained her credential in school counseling and certified as a facilitator and trainer for Active Parenting NOW. Her strengths are within the realm of facilitation, training, mentoring and counseling. Colette is currently serving as the Chief Program Officer for Horn Development Consulting.

Estella is a first-generation Filipina-American, born and raised in Daly City, CA. As a child of Filipino immigrants, Estella was instilled with a strong sense of “kapwa,” a Filipino cultural concept of interpersonal togetherness, directed towards the preservation and strengthening of human relationships. This sense of “kapwa” has inspired Estella during her 20 years of experience in community mental health and higher education. Estella has her BA in Clinical Psychology and MA in Counseling Psychology with an emphasis in Marriage and Family Therapy (MFT). Estella has worked as a social worker providing care for families of children with developmental disabilities in the East Bay. After graduate school, she was hired as a staff counselor at a San Mateo County community mental health center where she managed the out-patient adolescent alcohol and drug treatment program. Estella also was a member of the center’s school team and served as a K-12 school counselor at San Mateo County schools where she co-managed after-school programs for at-risk youth and facilitated peer groups on racial identity and on the acculturation of immigrant youth into American schools. In addition to her roles as a program coordinator and adjunct professor for the Counseling Psychology Department at the University of San Francisco, Estella is also serving as the Administrative Director for Horn Development Consulting.

Aimee is originally from Modesto, California, but has lived in the bay area for the last 10 years. Aimee is of Jewish decent and enjoys connecting to her heritage. Aimee received her Bachelor of Arts in Psychology from San Francisco State University in 2008 and is projected to receive her graduate degree in Counseling Psychology with an emphasis in Marriage and Family Therapy from the University of San Francisco in May of 2018. Aimee is currently working with the Youth Service Bureau of the YMCA for her Traineeship year, where she gives culturally appropriate mental health services to an array of clients. Aimee, first became associated with Dr. Horn, when he taught her “Counseling Across Cultures” class at the University of San Francisco. Since, then Dr. Horn has mentored Aimee. Aimee serves as a volunteer for HDC, where she has actively made website and media updates.

Originally born in Oakland, California, Jonathan Flannes has lived in various cities, including New York, Los Angeles, and San Francisco. Jonathan received his Bachelor of Arts in Applied Psychology from New York University and will be receiving his Marriage and Family Therapy Associate (MFTA) license in May of 2018. He is currently in his final semester at the University of San Francisco’s MA in Counseling Psychology program and working as a Marriage and Family Therapy Trainee (MFTT) therapist for the Marina Counseling Center, a non-profit, sliding-scale clinic in San Francisco. Jonathan has previously worked providing in-home therapy for high-risk youth and their families, serving as an ally for families who have been institutionally marginalized. Jonathan has additionally worked as a mental health counselor for a non-public school in Oakland, and as an author in the field of positive psychology. Jonathan has been mentored by Dr. Aaron L. Horn since first meeting him at the University of San Francisco. Jonathan currently serves a volunteer consultant for HDC.

Rylan Rosario, BA, MFTT

HDC Volunteer Consultant

Rylan is originally from San Jose, California, and has lived in various cities throughout the bay area. Rylan Rosario comes from a multiracial background and feels very close to her African American and Pacific Islander roots. She is the first in her family to attend college, and in doing so, she has become an advocate for first-generation students. Rylan holds a Bachelor of Science in Health Sciences from San Jose State University in 2011 and will be graduating from the University of San Francisco May 2018 with a Master of Arts in Counseling Psychology. Her educational journey continues this Fall at Howard University with a Ph.D. in Counseling Psychology. Rylan Currently works as a Therapist Trainee for Project Prevent through San Francisco Unified School District. She provides individual and group trauma-informed school-based counseling in the Bayview Hunters Point neighborhood for children and families. Dr. Horn has previously been Rylan’s professor in Counseling Across Cultures and for the last three years has been her mentor. Rylan serves as a remote volunteer consultant for HDC